I have volumes 1 through 3 of Space Ghost on DVD. I'm still really miffed that I didn't pay attention when they were released though as there are at least two other volumes in the series. And they're out of print. Ebay has them, but at pretty steep prices.
Adult Swim was amazing when it began. Space Ghost actually predates it by a few years, and I think was the inspiration for the Adult Swim block.
Harvey Birdman, Sealab (during the Murph years), Venture Bros, The Brak Show, Aqua Teen Hunger Force (not consistently funny, but does have its moments of greatness)...and of course, the commercials.
Ah, the commercials. Such greatness.